Dust-separating machine



(No Model.) 3 Sheets-Sheet. 1.

W..W. GREEN. DUST SEBABATING MACHINE.

N0. 508,611. Patented Nov. 14, 1893.

(Np Mode1.) -3 sh ets-sheet 2.

W. W. GREEN. DUST SEPARATING MAGHINE.

No. 508,611. memed Noam, 1893.

ksisas." wq ZZZ/6725071 UNIT D ST TES PATENT OFFICE.

WILLIAM W. GREEN, OF CHICAGO, ILLINOIS.

DUST-SEPARATING MACHINE.

SPECIFICATION forming part of Letters Patent No. 508,611, dated November14,1893.

Application filed October 13, 1890.

To a. whom it may concern:

3e it known that 1, WILLIAM W. GREEN, a citlzen of the United States,residing at Ohicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Dust-SeparatingMachines, of which the following is a full, clear, and exactdescription, that will enable others to make and use the same, referencebeing had to the accompanying drawings, forming a part of thisspecification.

This invention relates to improvements in that class of dust separatorswhich may be used for general purposes, and has for its ob ject theseparating of the dust from the material and quietly depositing the sameand re turning and using the volume of air over again, thus obtaining afiner separation and preventing the air from passing out with andspreading the dust.

Figure l is a side elevation of an apparatus embodying my improvedfeatures; shown partly in section; Fig. 2 a vertical transverse sectionin plane 2, Fig. 4; Fig. 3 a vertical longitudinal section in plane 3,-Fig. 4; Fig. 4: a plan; and Fig. 5 a broken-away horizontal section inplane 5 Fig. 1. 7

Referring to the drawings, A represents'the separating machine, B a dustreceiving chamber and B a fan.

In the present application the machine consists. of a rectangularbox-like structure having the shaft passing longitudinally therethrough.The respective ends of this shaft are provided with suitable journalbearings as shown.

O is a screening cylinder mounted-on the shaft inside of the inclosingcasing of the machine, as shown in Figs. 2 and 3. The surface of thescreening cylinder is composed of wire cloth having difierent sizedmeshes. The section a. is quite fine, section a coarser and section astill coarser, so as to divide the material into as many different lotsor grades.

The bottom of the machine is provided with a corresponding number ofdischarge-hoppers, a having inclined sides through which the difierentlots of screened material are discharged. The matter to be screened isfed in through the hopper (1 located at one end of the machine, thetailings passing out through the spout, a at the opposite end.

Serial No. 3 6 7, 91 (No model.)

Considerable space is left between theunder side of thescreening-cylinder and the discharge hoppers in the bottom, so as toprovide the air-chamber a The inclined wings, a a", carry the material,as it drops from the screening-cylinder toward the center, and form thecontracted passage or through which the material must drop and theair-current pass up through, thus rendering the operation of separatingand carrying away the dust more effective.

The fan B is placed on the top of the machine near one end, as shown inFigs. 3 and 4. One end of the suction-pipe D is connected to the fan;the opposite end being curved downwardly and openinginto the interior ofthe machine through the top and near the opposite end from the fan. Theslide or gatevalve, a, provides means for increasing or diminishing thearea of the passage in the pipe D. The fan-shaft 1) passeslongitudinally through the pipe D and is provided with suitablejournal-bearings, as shown. The pulley b on one end of the fan-shaftreceives the belt 5 from the motive power. Motion is transmitted to thescreening-cylinder from the pulley b on the fan shaft, through themedium of the belt b the pulley b the counter-shaft b", upon which thesame is mounted, the pinion b mounted on said countershaft'and thegear-wheel b mounted on the cylinder-shaft.

The cylindrical dust-chamber or receptacle B is located at one side ofand adjacent to the machine, and is supported on the legs d.

The horizontal delivery-pipe F connects the fan and upper part of thedust-chamber (see Figs. 1 and4.) and is provided at an intermediatepoint with the pocket 01, having the discharge-pipe d. The heavierparticles, drawn through by the action of the fan, will fall into thepocket (1 and may be discharged therefrom by means of the valve (1 thuskeeping the passage clear.

The vertical tube, G, is inserted down through the top of the dustreceptacle and stops short of the lower end thereof, thus forming adust-trap, as shown in Fig. 1. To

the upper projecting part of this tube is connected one end of theangular return-pipe, H; the opposite end of which is inserted in thelower part of the machine and opens into ICC the air-space below thescreening-cylinder, as shown in Fig. 3.

I11 operation the fan draws the dust and air out of the machine andforces it into the dustrecelving-chamber through the delivery-pipe F,where it takes a spiral downward course around the trapping-tube in saiddust-chamber; the air being drawn into the lower open end or mouthofsaid tube and returned and discharged into the machine below thescreenlng-cylinder, as indicated by the arrows; the dust separatedquietly settling down through the lower conical or contracted end, g, ofthe dust-chamber. Thus the same air is used over again and is preventedfrom passing out with the dust and agitating and spreading the samethroughout the building to the annoyance of the workmen.

The dust-chamber or receptacle and fan maybe used in connection withdifferent machines froin the one illustrated for the purpose of quietlydisposing of the dust without the same being blown all over thecompartment orbuilding; such application of the fan and dust-chamberbeing now in use in connection with an ore-crushing machine;

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a dust-separating machine, the combination of ascreening-cylinder, a casing therefor, a fan located on top of saidcasing, asuction'pipe connecting the fan and the casing, adust-receiving chamber, a horizontal delivcry-pipe connecting the fanand the said chamber, a tube extending down into the chamber and openingabove the bottom thereof, and a pipe connecting with the upper end ofthe tube and leadinginto the casing below the screening-cylinder.

2. In a dust-separating machine, the combination of ascreening-cylinder, a casing therefor, a fan located on top of saidcasing,a suction-pipe connecting the fan and the casing, adust-receiving chamber, a horizontal delivery-pipe provided with avalved pocket and connecting the fan and the dust-chamber, a tubeextending down into the chamber and opening above the bottom thereof,and atortuous pipe connecting with the upper end of the tube and leadinginto the casing below the screening-cylinder.

3. In a dust-separating machine, the combination of ascreening-cylinder, a casing therefor, a fan located on the top of thecasing, a suction-pipe connectingthe fan and the casing, adust-receiving chamber having an open lower end, a horizontal deliverypipe connecting the fan and the casing, a trapping tube arranged withinthe said chamber and extending nearly to the bottom thereof, and atortuous return-pipe connecting with the upper end of the said tube andleading into the air-space between the screening-cylinder.

WILLIAM W. GREEN. Witnesses:

JAMES MORRISON, L. B. COUPLAND.

